RAID, or Redundant Array of Independent Disks, is a technology for saving data on several hard drives that operate together as a single logical unit. The drives can be physical or logical i.e. in the second case one single drive is split into independent ones using virtualization software. In any case, exactly the same data is saved on all drives and the basic advantage of using this kind of a setup is that in the event that a drive fails, the data will still be available on the other ones. Using a RAID also improves the performance as the input and output operations will be spread among a number of drives. There are several kinds of RAID depending on how many drives are used, whether writing is performed on all drives in real time or just on a single one, and how the information is synchronized between the drives - whether it's recorded in blocks on one drive after another or it is mirrored from one on the others. These factors show that the error tolerance and the performance between the various RAID types may differ.
RAID in Cloud Web Hosting
Our cutting-edge cloud hosting platform where all cloud web hosting accounts are created employs quick SSD drives as an alternative to the traditional HDDs, and they work in RAID-Z. With this configuration, a number of hard disks operate together and at least 1 is a dedicated parity disk. In simple terms, when data is written on the remaining drives, it is duplicated on the parity one adding an extra bit. This is done for redundancy as even if some drive fails or falls out of the RAID for whatever reason, the information can be rebuilt and verified thanks to the parity disk and the data recorded on the other ones, so absolutely nothing will be lost and there won't be any service interruptions. This is an additional level of protection for your information along with the top-notch ZFS file system which uses checksums to make sure that all data on our servers is intact and is not silently corrupted.
RAID in Semi-dedicated Hosting
The RAID type that we use for the cloud hosting platform where your semi-dedicated hosting account will be created is named RAID-Z. What is different about it is that at least one of the disks is employed as a parity drive. Simply put, whenever any kind of data is copied on this special hard drive, one more bit is included to it and in the event that a problematic disk is changed, the info which will be duplicated on it is a mix of the data on the remaining drives in the RAID and that on the parity one. This is done to guarantee that the data is intact. Throughout this process, your websites will be functioning normally because RAID-Z allows for an entire drive to fail without any service disruptions and it simply works by using one of the remaining ones as the main production drive. Using RAID-Z together with the ZFS file system that uses checksums to guarantee that no data will get silently corrupted on our servers, you won't need to worry about the integrity of your files.
RAID in VPS Hosting
The SSD drives which we use on the machines where we generate virtual private servers work in RAID to ensure that any content you upload will be available and intact all the time. At least 1 drive is employed for parity - one bit of information is added to any data copied on it. In case a main drive fails, it is changed and the data which will be cloned on it is calculated between the remaining drives and the parity one. That’s done to make sure that the needed information is copied and that no file is corrupted since the new drive will be incorporated into the RAID afterwards. We also use hard disk drives functioning in RAID on the backup servers, so if you add this upgrade to your VPS plan, you'll use an even more reliable hosting service as your content will be available on multiple drives regardless of any sort of unexpected hardware failure.